Null pointer dereference in Xen - CVE-2018-18883
Published: November 2, 2018 / Updated: November 2, 2018
Vulnerability identifier: #VU15697
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2018-18883
CWE-ID: CWE-476
Exploitation vector: Adjecent network
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an adjacent attacker to cause DoS condition on the target system.
The vulnerability exists due to NULL pointer dereference when handling malicious input. A x86 HVM and PVH guest can send specially crafted content, execute arbitrary virtualization instructions, trigger null pointer deference and cause the service to crash on the host system.
Affected software
Xen
xen (Alpine package)
xen
Opensuse
Fedora
xen (Alpine package)
xen
Opensuse
Fedora
How to mitigate CVE-2018-18883
Install update from vendor's website.
xen (Alpine package) - update to 4.8.5-r0
xen - addressed in versions 4.9.3-2.fc27, 4.10.2-2.fc28, 4.11.0-8.fc29
xen - addressed in versions 4.9.3-2.fc27, 4.10.2-2.fc28, 4.11.0-8.fc29